Patent GB-1294329-A (GB)
Title: Rotary positive-displacement fluid machine
IPC: F01C5/00
Filed: 1969-11-26
Abstract: 1294329 Rotary positive-displacement machines WORTHINGTON CORP 26 Nov 1969 [13 Dec 1968] 57881/69 Heading F1F A machine usable as a pump, compressor, motor, motor-and-pump or motor-and-compressor has working chambers 82,84 separated from each other by a flexible band 70 secured at its ends by a rivet 76 which is trapped between a housing 8 and a fixed core 46, and attached to a pin 68 that is rotatively and eccentrically lodged in a rotary shaft 14. Slots 38, 40 and 47,48 connect the ends of the chambers to respective passages in a plate 6 and conduits attached thereto for the working fluid. Rotation of the shaft produces corresponding motion of the band and consequently a pumping action resembling peristalsis, Figs. 11A to 11D, (not shown), the chambers being connected either in series or in parallel. Alternative ways of securing the band to the core and the housing are described, Figs. 9 and 10 (not shown). In another embodiment, Fig.13, the slots are replaced by passages 166,168,178,180 and the ends of the band are secured by pins 158,160 within apertures 162,164 in the core 156, which like the housing 150 is shaped to obtain greater fluid displacement per revolution of the shaft 14. Further embodiments, Figs. 15 to 19 (not shown), are somewhat similar and such that even greater fluid displacement is obtained. The shaft 14 and the pin 68 may be replaced by a crank shaft coupled to the band by a sliding-rocking lever, Figs. 20 to 23 (not shown), the ratio of the volumes of the working chambers being dependent upon the position of the fulcrum of the lever relative to the crank shaft. Alternatively, the shaft 14 and the pin 68 may be replaced by a crank shaft per se Figs.24 to 26 (not shown). The ends of the band may be secured to the housing such that the effective length of the band can be adjusted during assembly, Figs. 27 and 28 (not shown). Alternatively, the ends of the band may be attached to a screw-threaded bar so at permit adjustment of the band length while the pump is operating, Fig.29 (not shown). The band may be replaced by two bands having equal lengths and their ends secured to the pin 68 and the housing, Figs. 30 to 38 (not shown). The band may be laminated, Figs. 39 to 43 (not shown), the laminae being either bonded to each other or separate with possibly a graphite or molybdenum compound therebetween. To obviate leakage across the edges of the band, two axiallymovable band-members may be pressed apart by resilient tabs on one of them, Figs. 44 to 49 (not shown). Inner and outer bands may be provided and mounted such that a cooling fluid can flow therebetween, Figs. 50 to 54 (not shown). The machine may comprise two identical units disposed in tandem, Figs.55 and 56 (not shown), which may be connected in series. In further embodiments, Figs.57 to 61 (not shown), six units are coupled to a common shaft and disposed circumjacent thereto, the units being single or double acting and possibly operating at different rates and/or connected in series. In two more embodiments, Figs.62 to 64 (not shown), the machine is similar to that shown in Fig.13 but modified such that the chambers 82,84 have common inlets and outlets for the working fluid. The band may be made of metal e.g. steel, rubber, or a plastics material, which may be glass-fibre reinforced. The housing, core and end plates may be made of metal, a reinforced ceramics material or a plastics material.